Substitutes in Polystyrene, Extruded Boardstock and Billet

Substitutes are reviewed on the basis of ozone depletion
potential, global warming potential, toxicity, flammability,
and exposure potential. Lists of acceptable and unacceptable
substitutes are updated several times each year. A
chronological list of SNAP
updates is also available.

Note: SNAP Notices and Final Rules published in the
Federal Register take precedence over all information
on the web site.

Alternatives exist with lower or
zero-ODP. Exemptions exist for (1) the use of HCFC-141b
for space vehicle, nuclear and defense foam
applications, (2) the use of HCFC-141b for laboratory
research and development applications for foreign
customers and (3) the use of fully formulated HCFC-141b
foam systems in inventory before January 1, 2005, until
July 1, 2005. See the September 30, 2004, final rule, 69
FR 58269, for further information.

HCFC-22, HCFC-142b or blends thereof

CFCs

Alternatives exist with lower or zero-ODP. (For existing users of HCFC-22 and HCFC-142b in polystyrene extruded insulation boardstock and billet as of November 4, 2005, the unacceptability determination is effective on January 1, 2010.